package cn.itsource.org.service.impl;

import cn.itsource.basic.annotation.LogAOP;
import cn.itsource.basic.exception.BusinessException;
import cn.itsource.basic.service.impl.BaseServiceImpl;
import cn.itsource.org.domain.Department;
import cn.itsource.org.mapper.DepartmentMapper;
import cn.itsource.org.service.DepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements DepartmentService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private DepartmentMapper departmentMapper;


    @LogAOP
    @Transactional
    @Override
    public void add(Department department) {
        departmentMapper.add(department);
        handleDirPath(department);
        departmentMapper.update(department);
    }

    //抽却公共部分
    private void handleDirPath(Department department) {
        String dirPath="";
        Long parentId = department.getParentId();
        if (parentId != null){
            Department parent = departmentMapper.findOne(parentId);
            dirPath =parent.getDirPath() + "/" + department.getId();

        }else {
            dirPath ="/" +  department.getId();
        }
        department.setDirPath(dirPath);

    }

    @LogAOP
    @Transactional
    @Override
    public void update(Department department) {
        if (department.getId() == department.getParentId()){
           throw new BusinessException("上级部门不能选择自己");
        }
        handleDirPath(department);
        departmentMapper.update(department);
    }

    @LogAOP
    @Override
    public void delete(Long id) {
        super.delete(id);
    }

    //接口：查询部门树
    @Override
    public List<Department> deptTree() {
        // 1. 一次性查询出所有数据，放到内存中，可以使用map
        // 2. 从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
        // 3. 遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = departmentMapper.findAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }
        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParentId() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParentId();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.findOne(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                if (parentDepartment != null){  //判断parent_id的父级数据是否存在
                    //2.将自己装到  父部门 的children中
                    parentDepartment.getChildren().add(department);
                }
            }
        }
        return deptTree;
    }
}
